How to identify the quality of large steel pipe?

Stainless steel hose assembly hose. Stainless steel hoses are used to protect precision optical rulers and sensing lines. It has good flexibility, corrosion resistance, high temperature resistance, wear resistance, stretch resistance and water resistance. It also provides a certain shielding effect. Metal hose metal hose mainly refers to the spiral corrugated pipe; the other is the ring corrugated pipe.

Metal hose spiral bellows is a tubular shell with helically arranged corrugations. There is a helix angle between two adjacent corrugations. All corrugations can be connected by a spiral

An annular bellows is a tubular shell with closed circular corrugations. The waves are connected in series by circular corrugations. The annular corrugated pipe is processed by seamless pipe or welded pipe. Due to the processing method, the length of the single tube is usually shorter than the length of the spiral bellows. The advantages of annular bellows are good elasticity and low rigidity. Corrugated hose Corrugated hose is installed as a flexible pressure-resistant pipe fitting in the liquid delivery system to compensate for the mutual displacement of pipes or the connecting ends of machines and equipment,

Corrugated hose absorbs vibration energy and can reduce vibration and noise. It has the characteristics of good flexibility, light weight, corrosion resistance, fatigue resistance, high temperature and low temperature resistance. Plastic hoses Plastic hoses are divided into two types: one is completely sealed and impermeable, for example, for propellant delivery in launch vehicles, gas and water heaters; the other

Continuous winding tape for plastic hoses. Ordinary wound corrugated pipes are used to protect cables, such as telephones and machine tools. The corrugated tube of the table lamp is clamped with steel wire during the production process. Rubber hose Rubber hose. In most cases, without any test tools and test conditions, we can roughly identify the quality of PVC steel pipes based on the senses of vision, smell, and touch.

1. Observe whether the lumen is regular and whether the wall thickness is uniform. The inner cavity and outer edge of the high-quality large steel wire pipe are evenly distributed in the standard circular pipe wall. Take a large steel wire pipe with an inner diameter of 89mm and a wall thickness of 7mm as an example. The wall thickness of the pipe with poor quality can reach 7.5mm, and the thin part is only 5.5mm. When the large steel pipe works under high pressure, it is easy to burst or deform due to the uneven force of the pipe wall.

2. Observe whether there are bubbles or other visible objects on the wall of the large steel wire pipe that are colorless and transparent. High quality large steel wire tube wall crystal clear, without any impurities. However, the color of defective large steel wire pipes may turn yellow due to improper handling, decomposition, aging or improper storage for a long time.

3. High-quality large steel wire pipe, except for a little plastic smell, there is no smell of any other petrochemical products. The low-grade steel pipe has an unpleasant smell of diesel, especially in the hot summer.

4. The inner and outer walls of the high-quality large steel wire pipe are smooth and feel good, while the inferior pipe is rough.

5. When measuring the wall thickness, cut off both ends of the large steel wire pipe, and select the middle pipe as a sample for testing to prevent some illegal manufacturers from doing things at both ends of the pipe. The actual wall thickness is thinner than the pipe ends.

6. Cut a few centimeters of steel wire at both ends of the PVC steel pipe, and fold the steel wire repeatedly to test the strength and toughness of the steel wire. Poor quality steel wire will break when folded once or twice, while the steel wire of high-quality PVC steel pipe can only be cut with special tools. The quality of the steel wire determines the quality of the entire pipeline. PVC steel pipes with quality problems caused by steel wires are prone to irreversible deformation.